Hello, and thank you for your question. I will be happy to assist you. Answers are for educational purposes only.
I would recommend taking the plan B today and then resuming with her birth control pill the next day after completing plan B. However, she should start with a new pack of pills when she restarts the birth control pill. She should then take a pregnancy test in about two weeks to be sure. It also wouldn't hurt to use backup (such as condoms or spermicide) for the whole next month of the pill to be safe. I hope this is helpful. Please let me know if I can answer any additional questions. Positive feedback is greatly appreciated.